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dc.contributor.advisorMa, Wenchao
dc.contributor.authorXu, Lina.
dc.date2004
dc.date.accessioned2020-09-16T21:06:09Z
dc.date.available2020-09-16T21:06:09Z
dc.identifier.urihttps://hdl.handle.net/11668/20257
dc.description.abstractAn optical fiber humidity sensor has been devised using a porous sol-gel silica (PSGS) coating as a transducer. Evanescent wave scattering (EWS) in the PSGS coating. PSGS particles are highly hydrophilic and have a strong tendency to absorb water molecules from the surrounding environment. The absorbed water molecules form a thin layer on the inner surface of the pores inside the porous silica and enhance EWS, from which an indicatory signal can be obtained. The humidity sensor presented in this thesis has a fast response, is reversible, low cost, and has a broad dynamic relative humidity range from 3.6?0-6% to 100% or humidity range from 1.2ppm to 30000ppm. Because of its multiple advantages, including immunity to electromagnetic interference, resistance to corrosive environments, and high sensitivity, this humidity sensor has various applications. In soil moisture sensing, this humidity sensor can avoid the interference caused by compounds in soil water. For electrical transformer moisture sensing, this humidity sensor can avoid the effect of electromagnetic fields.
dc.publisherMississippi State University
dc.subject.lccOptical fiber detectors.
dc.subject.lccDetectors.
dc.subject.lccHumidity.
dc.subject.lccScattering (Physics)
dc.subject.lccSilica gel.
dc.subject.otherrelative humidity
dc.subject.otherevanescent wave
dc.subject.otherscattering
dc.subject.othersol gel silica
dc.titleOptical Fiber Humidity Sensor Based on Evanescent Wave Scattering
dc.typeThesis
dc.publisher.departmentDepartment of Physics and Astronomy.
dc.publisher.collegeCollege of Arts and Sciences
dc.subject.degreeMaster of Science
dc.subject.majorPhysics
dc.contributor.committeeMonts, David L
dc.contributor.committeeTao, Shiquan


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